Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8f4f6b2e2ba33a…

MALICIOUS

PDF

86.6 KB Created: 2021-01-08 18:08:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1bbcd4f6151e146f733c5fbaabb19c4d SHA-1: 2db63b3f9d99268919f5f12956daf979f61732d0 SHA-256: 4c8f4f6b2e2ba33a5f793464122aba59a1f3e0d6e586e21d71c7d51587aefad6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent link leading to 'trafftec.ru', suggesting a phishing or download lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are to S3 buckets, potentially used to obscure the true malicious destination. No scripts were extracted, but the presence of external links and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a social engineering attempt to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafftec.ru/aws?utm_term=biodata+for+marriage+template+in+word PDF link annotation
    • https://cdn.sqhk.co/saseponirifa/BahiihX/free_message_tones_for_android_phones.pdfIn PDF document text
    • https://waziketezu.weebly.com/uploads/1/3/4/6/134648841/xexawiwegu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vajefam/saki_saki_mp4_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/20968727588.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/bonne_pratique_de_fabrication_pharmaceutique.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/42311976728.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/metamorphic_rock_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/consumers_report_cars_to_avoid.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/selowadixalajedural.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/gubanuxarijodoj.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/43070757476.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/71679370624.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 5324 bytes
SHA-256: f34e8e9e8f9a15219f6182c94754c2d01dc7df06d21c237d1756ed22ec5d12d9
font_01_sfnt_off0001290e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290E 10612 bytes
SHA-256: ed03f386abe5e3a352b0178b09efccf424dc71b2d285a22e8d6157aa24c4ff82

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